DT bindings as ABI [was: Do we have people interested in device tree janitoring / cleanup?]
From: richardcochran@gmail.com (Richard Cochran)
Date: 2013-07-25 18:48:54
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On Thu, Jul 25, 2013 at 07:29:20PM +0100, Mark Rutland wrote:
On Thu, Jul 25, 2013 at 07:05:48PM +0100, Stephen Warren wrote:quoted
I don't think having people "rely" on the bindings is the issue so much as the awareness that if they do, there will be compatibility issues for unstable bindings.As long as we can make sufficiently clear that trying to use an unstable binding is going to be *very* painful, and not necessarily supported.
Oh, man. The introduction of DT into ARM Linux was supposed to make everyone's life sooo much easier. Of course, based on experience with powerpc, I never believed it*, but still I would expect to hear that the DT bindings are, well, a *binding* contract between the board developer, boot loader, and the kernel. Once it is working with a particular kernel, a DT board description file should continue to work indefinitely with newer kernels. Anything less is a regression, pure and simple. If you go around changing the bindings willy nilly, then what is point of having DT at all? Thanks, Richard * http://lists.infradead.org/pipermail/linux-arm-kernel/2011-April/046963.html http://lists.infradead.org/pipermail/linux-arm-kernel/2011-May/050255.html http://lists.infradead.org/pipermail/linux-arm-kernel/2011-May/050256.html http://lists.infradead.org/pipermail/linux-arm-kernel/2011-May/050264.html